* Click the '''Settings''' button next to the simulation mode dropdown list to open up the HDMR Settings Dialog.
* On the left side of the "[[Variables]]" section of the dialog you see the "'Independent [[Variables]] Table", which lists all the available independent [[variables]] of your project. Select an independent variable from the table and use the Right Arrow (-->) button of the dialog to move it to the "HDMR [[Variables]] Table".
* Before moving the variable to the new location, the "Define HDMR [[Optimization]] Variable Dialog" opens up, where you have to define the start and stop values of the variable along with its (ignore the precision).
* Once you finish the definition of an HDMR variable, its name and attributes are added to the HDMR [[Variables]] List.
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Note that you can change your mind and remove an HDMR variable from the list. To do so, select its name or row from the list and use the {{key|Left Arrow (<--)}} button to move it back to the Independent Variables Table. You can also change the attribute values of an HDMR variable after it has been defined. Select the variable from the list and click the {{key|Edit}} button of the dialog.
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==Defining HDMR Functions ==